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Memorizing important quadric shapes.
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z = Ax² + Bx²
Elliptic Paraboloid (bowl)

z = Ax² - By²
Hyperbolic Paraboloid (saddle)

x²/A² + y²/B² + z²/C² = 1
Ellipsoid (stretched sphere)

z² = Ax² + By²
Double Cone

x²/A² + y²/B² - z²/C² = 1
Hyperboloid of One Sheet

-x²/A² - y²/B² + z²/C² = 1
Hyperboloid of Two Sheets

Ax² + Bx² +Cz² = 1
Sphere
